From 11f108282c97ff0240f4fc6f2c3a1110f136f30f Mon Sep 17 00:00:00 2001
From: Comma Device <device@comma.ai>
Date: Wed, 19 Aug 2026 18:19:43 +0800
Subject: [PATCH] revert: chestnut: don't compile if big model is LFS pointer
 (#38670) (undoes e09980f2c1)

---
 openpilot/selfdrive/modeld/SConscript  | 6 +-----
 openpilot/selfdrive/modeld/helpers.py  | 4 ----
 openpilot/system/hardware/hardwared.py | 4 ++--
 3 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/openpilot/selfdrive/modeld/SConscript b/openpilot/selfdrive/modeld/SConscript
index 8b2322f94..30a31aae2 100644
--- a/openpilot/selfdrive/modeld/SConscript
+++ b/openpilot/selfdrive/modeld/SConscript
@@ -7,7 +7,7 @@ from openpilot.common.file_chunker import chunk_file, get_chunk_targets, get_exi
 from openpilot.common.transformations.camera import _ar_ox_fisheye, _os_fisheye
 from openpilot.common.transformations.model import MEDMODEL_INPUT_SIZE, DM_INPUT_SIZE
 from openpilot.selfdrive.modeld.constants import ModelConstants
-from openpilot.selfdrive.modeld.helpers import TG_INPUT_DEVICES_PATH, big_model_source_available, usbgpu_present, modeld_pkl_path
+from openpilot.selfdrive.modeld.helpers import TG_INPUT_DEVICES_PATH, usbgpu_present, modeld_pkl_path
 
 
 CAMERA_CONFIGS = [
@@ -44,10 +44,6 @@ tg_devices = { # which device to put jit inputs to at runtime
 }
 
 USBGPU = usbgpu_present()
-if USBGPU and not big_model_source_available():
-  print("Big model source unavailable, skipping big model build")
-  USBGPU = False
-
 if USBGPU:
   usbgpu_tg_flags = f'DEBUG=2 DEV=USB+AMD:LLVM WARP_DEV={tg_backend} FLOAT16=1 JIT_BATCH_SIZE=0 GMMU=0 TC_OPT=2'
   # the USB+AMD GPU takes an exclusive flock; serialize all targets that touch it
diff --git a/openpilot/selfdrive/modeld/helpers.py b/openpilot/selfdrive/modeld/helpers.py
index ffd59eae0..37ab0b26d 100644
--- a/openpilot/selfdrive/modeld/helpers.py
+++ b/openpilot/selfdrive/modeld/helpers.py
@@ -21,10 +21,6 @@ def modeld_pkl_path(usbgpu: bool):
   prefix = 'big_' if usbgpu else ''
   return MODELS_DIR / f'{prefix}driving_tinygrad.pkl'
 
-def big_model_source_available() -> bool:
-  model_path = MODELS_DIR / 'big_driving_supercombo.onnx'
-  return model_path.is_file() and model_path.stat().st_size >= 1024
-
 def dump_oob(obj, f):
   with tempfile.TemporaryFile(dir=".") as tmp:
     def buffer_callback(pb: pickle.PickleBuffer):
diff --git a/openpilot/system/hardware/hardwared.py b/openpilot/system/hardware/hardwared.py
index ccdb38057..2b1ce8ae4 100755
--- a/openpilot/system/hardware/hardwared.py
+++ b/openpilot/system/hardware/hardwared.py
@@ -16,7 +16,6 @@ from openpilot.common.utils import strip_deprecated_keys
 from openpilot.common.filter_simple import FirstOrderFilter
 from openpilot.common.params import Params
 from openpilot.common.realtime import DT_HW
-from openpilot.selfdrive.modeld.helpers import usbgpu_compiled
 from openpilot.selfdrive.selfdrived.alertmanager import set_offroad_alert
 from openpilot.common.hardware import HARDWARE, COMMA_HARDWARE
 from openpilot.common.basedir import BASEDIR
@@ -239,7 +238,8 @@ def hardware_thread(end_event, hw_queue) -> None:
 
   fan_controller = FanController(int(1./DT_HW))
   chestnut = Chestnut()
-  big_model_available = usbgpu_compiled()
+  big_model_available = os.path.isfile(os.path.join(BASEDIR, "openpilot/selfdrive/modeld/models/big_driving_supercombo.onnx")) or \
+                        os.path.isfile(os.path.join(BASEDIR, "openpilot/selfdrive/modeld/models/big_driving_tinygrad.pkl.chunkmanifest"))
 
   while not end_event.is_set():
     sm.update(PANDA_STATES_TIMEOUT)